Steering Torque Control Around Neutral Position in Vehicles
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Solution Overview
Problem
Conventional vehicle control systems fail to improve maneuverability and stability without causing discomfort to the driver when the steering wheel is turned in one direction and then returned, especially after passing through the neutral position, due to continued torque increasing control leading to unwanted acceleration.
Innovation Solution
A control system that includes a driving force source, a steering wheel, and a controller that reduces torque for deceleration when turning in one direction and increases torque for acceleration when returning, with the controller managing torque to prevent forward acceleration after passing the neutral position and applying deceleration when necessary, using a steering angle sensor to detect and respond to steering operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If torque increasing control is continued after the steering wheel passes through the neutral position, then the response of vehicle acceleration to steering operation is improved, but unwanted forward acceleration occurs during turning operation causing driver discomfort
Solution Approach 1:
The controller continuously monitors the steering angle via the steering angle sensor and uses this feedback to determine when to switch from torque increasing control to torque decreasing control. When the steering angle indicates the wheel has passed through the neutral position, the feedback signal triggers the torque reduction to prevent unwanted acceleration during the turning phase.
Solution Approach 2:
The system dynamically adjusts the driving torque based on the real-time steering operation phase. The controller transitions the torque control strategy from increasing (during return to neutral) to decreasing (after passing neutral into turning) based on the steering angle, making the torque application adaptive to the current steering state rather than static.
2Stability of the object's composition
If torque decreasing control is performed when the steering wheel is turned in one direction, then vehicle stability during turning is improved, but the maneuverability may be reduced if torque reduction is excessive or poorly timed
Solution Approach 1:
The controller applies torque decreasing control in advance during the return-to-neutral phase before the actual turning operation begins. This preliminary torque reduction prepares the vehicle for the upcoming turn, ensuring stability is established before the steering wheel passes through the neutral position into the turning phase, thereby maintaining both stability and maneuverability.
Data Source
AI summary
A control system for a vehicle is provided, which includes a driving force source configured to generate torque for driving drive wheels, a steering wheel, a steering angle sensor, and a controller. Based on the detected steering angle, the controller reduces the driving torque to add deceleration to the vehicle when the steering wheel is being turned in one direction, and increases the torque to add acceleration when the steering wheel is being turned back in the other direction. The controller controls the torque, when the steering wheel is being turned in the returning direction from a state where it is turned in the one direction, so as to add forward acceleration until the steering wheel returns to a neutral position, and when the steering wheel is then being turned in the other direction after passing through the neutral position, so as not to add the forward acceleration.